Hopefully someone can explain to me the benefit of stealing $12m of bitcoin. Am I right in thinking it can only be traded or sold to another bitcoin vendor? And if that's the case, won't it be incredibly easy to track? Does bitcoin not have a digital signature of some sort?

Baffling shit tbh.

Ultimately all bitcoin transactions are public, stored in the Bitcoin network. It's down to the individual how many hoops they want to put in the way but IP addresses involved in bitcoin transfers can be logged because it's a peer-to-peer network.

So yeah, you can be traced but it's a bit more complex than:

Brick Top: Do you know these tits, Errol?
Errol: I know a lot of tits, Guv'nor. But I don't know any quite as fucking stupid as these two.
Brick Top: John?
John: I can't help, Guv.
[Tyrone pokes his head in the door]
Errol: Ah, Tyrone.
Errol, John: You silly fat bastard.